JP4693099B2 - Pipe fitting - Google Patents

Description

  According to the present invention, an end piece formed on the inner surface of the joint body is disposed by disposing a retaining piece held by the piece holding member between the joint body and the pipe and moving the piece holding member axially outward. The present invention relates to a pipe joint provided with a retaining mechanism that presses a piece against a tapered surface having a small diameter to prevent the pipe from coming out.

  Conventionally, by placing a hard roll-shaped piece between the joint body and the pipe, and moving the sleeve supporting this piece outward in the axial direction, the piece is pressed against the tapered surface formed on the inner surface of the joint body, For example, Patent Document 1 and Patent Document 2 show pipe joints that lock the pipe with respect to the joint body.

In the invention of the above-mentioned Patent Document 1, as a means for moving the frame holding member, a screw (8) whose tip abuts against the end surface of the joint head (2) is screwed into the flange portion (4d) of the sleeve (4). The sleeve (4) is formed to move by screwing the screw (8). Further, in the invention of Patent Document 2, a screw portion (4f) is provided on the outer periphery of the sleeve (4), and a ring-shaped handle (8) is screwed to the sleeve (4). The sleeve is formed to move by being screwed.
JP 2002-98276 A JP 2003-14183 A

  However, in the former conventional invention, since the screws (8) are arranged in parallel and close to the side surface of the pipe, the operation of rotating with a tool is very troublesome, and is equally spaced in the circumferential direction. Since a plurality of screws are provided with a gap, the complexity of the work is even more serious. In the latter invention, when the handle (8) is rotated and the sleeve (4) is screwed, the handle (8) and the sleeve (4) may rotate together in the initial movement, resulting in poor operability. Moreover, since the pressing pressure against the tapered surface of the top changes depending on the tightening of the handle by the operator, that is, the tightening torque, the torque management in the work is troublesome, and in addition, the handle (8) is several times before tightening. There is a problem that workability is poor because it must be rotated about the rotation.

  Further, in the above-described conventional inventions, since the pipe outer peripheral surface is directly in contact with the inner peripheral surface of the sleeve, the weight of the pipe during connection work (usually, pipe connection work is Or a bending load is applied to the frame holding member, which causes great resistance to the axial movement of the sleeve, resulting in poor workability and possible malfunction of the sleeve. There is also a problem that a stable retaining action may not be achieved.

  Accordingly, the main object of the present invention is to provide a pipe joint with a simple structure that can quickly and surely perform a movement operation of a retaining piece with one touch.

  Furthermore, the second object of the present invention is to provide a novel pipe joint capable of moving the piece holding member in the axial direction smoothly and with one touch without the member holding the piece receiving the weight or bending load of the pipe. There is to do.

  In order to solve the above problems, the present invention takes the following technical means. That is, according to the present invention, a retaining piece is disposed between a tubular joint body and a pipe inserted into an end opening of the joint body, and a piece holding member for holding the piece is attached to the joint body. In the pipe joint in which the piece is pressed against the tapered surface formed on the inner surface of the joint body so that the opening end side has a small diameter by moving toward the outer side in the axial direction, the pipe holding is prevented. The member includes a ring-shaped body and a plurality of frame holding pieces extending from the ring-shaped body in the body axial direction and spaced apart in the circumferential direction, and provided at a tip portion of the frame holding piece. The frame is held by a holding portion, and a plurality of slits are formed at positions corresponding to the plurality of piece holding pieces on the inner peripheral surface of the end opening of the joint body, and the piece holding pieces are arranged in the slits Of the frame holding member In addition, a rotation operation ring is disposed between the opening end surface of the joint body and the ring-shaped body, and a cam is provided on the rotation operation ring to rotate the rotation operation ring. Thus, the ring-shaped body rides on the cam, and the frame holding member moves toward the outside in the axial direction.

  According to the present invention, the ring-shaped body of the piece holding member rides on the cam by turning the turning operation ring, and thereby the piece holding member is moved largely toward the axially outer side of the joint body opening end. Although the top can be pressed against the tapered surface of the joint body to prevent the pipe from coming off, the rotation of the rotation ring requires only a small angle until the ring-shaped body rides on the cam. Locking operation can be performed quickly and reliably with a single touch, and the frame holding pieces are arranged in a plurality of slits formed at predetermined intervals in the circumferential direction on the inner peripheral surface of the joint body. Since the rotation of the holding member is prevented, it is possible to completely prevent the top holding member from rotating together during the rotation of the rotation operation ring, thereby improving the work efficiency. There is.

  In the above invention, a convex portion is provided between the plurality of slits on the inner peripheral surface of the end opening of the joint body, and the inner diameter of the convex portion is smaller than the inner diameter of the top holding member and larger than the outer diameter of the pipe. By setting as such, the top holding member attached to the slit formed between the convex portions does not directly contact the pipe and the weight or bending load of the pipe is not directly applied. In this case, it is possible to prevent the torque higher than the initial setting from being applied when the rotating operation ring is rotated, and the piece holding member can be moved in the axial direction surely and smoothly. Preferably, the inner diameter of the convex portion is smaller than the inner diameter of the piece holding piece of the piece holding member. It is preferable that the top holding piece is configured to be elastically deformable so that the front end side thereof can be expanded and contracted in the radial direction, so that when the top holding piece is inserted into the end opening of the joint body, The frame holding member can be easily and quickly attached by reducing the diameter. And in the state which inserted the piece holding piece in the edge part opening of the coupling main body, it is preferable to make the internal diameter of a convex part smaller than the internal diameter of this piece holding piece.

  Further, in the present invention, the outer diameter of the pipe to be connected by the piece holding piece of the piece holding member having elasticity that expands and contracts in the axial direction so that the distance between the ring-shaped body and the holding portion can be slightly changed Even if there is a slight dimensional variation due to manufacturing errors in the processing of the taper surface, the fixing position of the frame, that is, the position where it is pressed against the inner surface of the taper surface and the outer peripheral surface of the tube, is fixed in the axial direction of the frame holding piece. It is automatically adjusted by the elastic expansion and contraction of this, so that it is possible to always exhibit a stable retaining effect, and to reliably exhibit the lock with a small amount of rotation of the rotating operation ring.

  Furthermore, in the present invention, the engaging recess and the engaging projection that engage with each other at the position where the ring-shaped body rides on the cam by rotating the rotating operation ring are in sliding contact with the rotating operation ring and the top holding member. By being provided on the surface, the position of the ring-shaped body riding on the cam can be recognized, and the rotation of the rotation operation ring can be stopped at the appropriate position. In addition to preventing the ring from being turned too much, it is possible to prevent the rotating operation ring from rotating accidentally after being locked.

  According to the present invention, since the top holding member can be moved in the axial direction with a small amount of rotation of the rotation operation ring, the tube can be quickly locked with one touch, and the pipe laying operation can be performed quickly. And efficiency improvement.

  Hereinafter, embodiments of the present invention will be described in detail based on the illustrated examples. In the figure, reference numeral A denotes a metal joint body, which has left and right receiving openings (end opening) 1 and 1 that receive the end of a metal pipe B to be connected. The present invention can be applied to TM joints and other various joint pipes such as elbows, cheeses, 45 ° cheeses, and single flange joints.

  As shown in FIG. 4, a first concave groove 2 and a second concave groove 3 are provided on the inner peripheral surface of the receiving port 1 with a partition wall 4 at a position that is a predetermined dimension deeper than the opening end. Yes. The first concave groove 2 on the opening end side is formed with a tapered surface 2a that increases in diameter toward the back side, that is, gradually decreases in diameter toward the opening end side. In addition, the innermost part of the first groove 2 is formed with an inner diameter dimension that allows a top 11 to be described later to be mounted while being movable in the axial direction. Further, a packing 5 is attached to the second concave groove 3 on the back side. In the present invention, the “axial direction” refers to a direction along the axis of the joint body A and the pipe B.

  Furthermore, as shown in FIG. 5, a plurality of (six in this embodiment) slits 6 extending in the axial direction with a certain interval in the circumferential direction are formed on the inner peripheral surface of the opening end of the receptacle 1 as a partition wall. It is provided in a state of being separated by the convex portion 7, and is formed so as to prevent rotation of the frame holding member by disposing a frame holding piece 10 of a frame holding member 8 to be described later in this slit 6. ing. Further, the inner diameter of the convex portion 7 is set to be smaller than the inner diameter of the frame holding member 8 and larger than the outer diameter of the tube B.

  Reference numeral 8 denotes a frame holding member. The frame holding member 8 extends in the axial direction from a ring-shaped body 9 and an inner edge of one end of the ring-shaped body 9 as shown in detail in FIG. A plurality of (six in this embodiment) frame holding pieces 10 formed at regular intervals in the circumferential direction and a frame 11 held at the tip of these frame holding pieces 10 are provided. It is integrally formed of a synthetic resin material having an excellent hardness and elasticity.

  The frame holding piece 10 of the frame holding member 8 is integrally formed with a spring portion 10a at an intermediate portion thereof, so that a portion for holding the frame 11 can be elastically expanded and contracted in the axial direction.

  The top 11 is made of a metal material having a high hardness and is formed in a barrel shape in which the middle abdomen is slightly swelled. The top 11 is attached to a top mounting hole (holding portion) 10 b formed at the tip of the top holding piece 10. Within frame 10, frame 11 can rotate about its axis. The diameter of the middle part of the top 11 is formed to be larger than the thickness of the top holding piece 10, and when the top 11 is moved together with the top holding member 8 toward the opening of the receiving opening, the tapered surface 2 a of the joint body A and the outer peripheral surface of the pipe B It is formed in such a size that the tube B can be locked with respect to the joint body A by being fitted like a wedge and pressing the taper surface and the outer peripheral surface of the tube strongly.

  Further, a rotation operation ring 12 is rotatably disposed on the outer peripheral surface of the piece holding piece 10 at a position exposed to the outside from the receiving end surface of the joint body A. The rotation operation ring 12 and the piece holding member are arranged. In this embodiment, six cam followers 13 are provided on the surface on the ring-shaped body 9 side, and cams 14 are provided on the surface on the rotating operation ring 12 side. Yes. The cam follower 13 has a trapezoidal shape when viewed from the side, and the cam 14 is formed in the shape of a groove in which the trapezoid is inverted so as to receive the cam follower 13. The cam follower 13 fitted into the cam 14 rides on the highest position of the cam 14, that is, the flat end surface of the rotation operation ring 12, so that the frame holding member 8 moves outward.

  Furthermore, when the rotation operation ring 12 is rotated and the cam follower 13 reaches the highest position of the cam 14, that is, the intermediate position between adjacent cams on the flat end surface of the rotation operation ring 12. Engagement recesses 15 and engagement projections 16 that engage and restrict the rotation of the rotation operation ring 12 are provided on the surface in which the rotation operation ring 12 and the frame holding piece 10 of the frame holding member 8 are in sliding contact. ing.

  In the pipe joint configured as described above, as shown in FIGS. 1 and 2, the pipe B is inserted into the receiving port 1 in a state where the top holding member 8 is mounted on the receiving port 1 of the joint body A together with the rotation operation ring 12. To do. At this time, the cam follower 13 of the frame holding member 8 is assembled in a state of being fitted into the grooved cam 13. Further, the frame 11 held by the frame holding piece 10 is in a state where there is play at the innermost part of the first recess 2 connected to the tapered surface 12a.

  From this state, when the rotation operation ring 12 is rotated to the position where the engagement irregularities 15 and 16 are engaged by a hand or a rotation tool, the cam follower 13 fitted into the cam 14 is camped as shown in FIG. 14, the top holding member 8 moves along with the top 11 toward the opening end of the receiving port 1. By this movement, the top 11 can be fitted like a wedge between the tapered surface 2a of the joint main body A and the outer peripheral surface of the pipe B, and the taper surface can be strongly pressed to lock the pipe B against the joint main body A. . Further, since the frame holding piece 10 of the frame holding member 8 is inserted into the slit 6 provided on the inner surface of the receiving port 1 and is prevented from rotating, the slit 8 is shared when the rotation operation ring 12 is rotated. There is no turning. Further, the rotation of the rotation operation ring 12 is caused by the engagement irregularities 15 and 16 provided at the intermediate positions of the six cam followers 13 that escape from the groove of the cam 14 from the position where the cam follower 13 is fitted in the cam 14. Since it is only necessary to rotate the angle until the engagement, that is, 30 degrees, the locking operation can be performed quickly and with one touch.

  In this embodiment, since the inner diameter of the convex portion 7 is set to be smaller than the inner diameter of the frame holding member 8 and larger than the outer diameter of the tube B, it is mounted on the slit 6 between the convex portions 7. The frame holding piece 10 is not directly subjected to its own weight or bending load of the tube B, and the frame holding member can be moved in the axial direction surely and smoothly.

  In the present embodiment, the frame holding piece 10 of the frame holding member 8 is formed in a state in which appropriate elasticity is imparted in the axial direction, so that the manufacturing error is added to the outer diameter of the pipe B to be connected. Even if there is a slight dimensional variation, the position where the frame 11 is pressed against the tapered surface 2a and fixed is automatically adjusted by the elastic expansion and contraction of the frame holding piece 10 in the axial direction, so that a stable removal is always achieved. The stopping effect can be demonstrated.

  In the present invention, as shown in FIG. 7, a cover 12 a that hides the peripheral surface of the ring-shaped body 9 of the frame holding member 8 may be provided on the rotation operation ring 12. As a result, the external aesthetics can be enhanced, and the exposed surface for the rotation operation can be widened to facilitate the rotation operation.

  As mentioned above, although the Example considered to be typical of this invention was described, this invention is not necessarily limited only to these Example structures. For example, the numbers of the frame holding pieces 10, the cams 14, and the cam followers 13 of the frame holding member 8 are not limited to the numerical values shown in the embodiment, and it goes without saying that the numbers may be increased or decreased. Further, the rotary operation ring 12 is knurled on the outer peripheral surface so that it can be manually rotated, or formed to have a different diameter so that it can be rotated with a rotary tool such as a wrench, or the rotary tool is caught. You may make it provide a joint protrusion, an engagement groove | channel, or an engagement hole in an outer peripheral surface. In addition, the present invention can be implemented with appropriate modifications within the scope of the present invention, achieving the object of the present invention, and achieving the effects of the present invention.

  The present invention can be used as a joint for pipes made of metal or synthetic resin such as a water pipe, a gas pipe, or a cable housing pipe.

It is a partial cross section side view which shows one Example of the pipe joint concerning this invention, Comprising: The state before a lock | rock is shown. The expanded sectional view of the principal part of FIG. The expanded sectional view similar to FIG. 2 which shows the state at the time of the lock of the said pipe joint. The perspective view of the top holding member and rotation operation ring in this invention. . Sectional drawing which shows only the coupling main body of the pipe coupling concerning this invention. Sectional drawing along CC line in FIG. Sectional drawing similar to FIG. 2 which shows another Example of the pipe joint concerning this invention.

Explanation of symbols

A Joint body B Tube 1 Receptor 2a Tapered surface 6 Slit 7 Protrusion 8 Top holding member 9 Body 10 Top holding piece 11 Top 12 Rotating operation ring 13 Cam follower 14 Cam 15 Engaging recess 16 Engaging projection

Claims (4)

A retaining piece is arranged between the tubular joint body and the pipe inserted into the end opening of the joint body, and the piece holding member for holding the piece is directed outward in the axial direction of the joint body. In the pipe joint that prevents the pipe from coming out by pressing the piece against the tapered surface formed on the inner surface of the joint body so that the opening end side has a small diameter by moving it,
The piece holding member includes a ring-shaped body and a plurality of piece holding pieces extending from the ring-shaped body in the body axial direction and spaced apart in the circumferential direction, and a tip portion of the piece holding piece The frame is held in a holding part provided in
A plurality of slits are formed at positions corresponding to the plurality of piece holding pieces on the inner peripheral surface of the end opening of the joint body, and the piece holding member is rotated by disposing the piece holding pieces in the slits. Is blocked,
Further, a rotation operation ring is disposed between the opening end surface of the joint body and the ring-shaped body, and a cam is provided on the rotation operation ring, and the ring-shaped body is cammed by rotating the rotation operation ring. A pipe joint that is configured such that the top holding member moves on the outer side in the axial direction by riding on the frame.   A convex portion is provided between the plurality of slits on the inner peripheral surface of the end opening of the joint body, and the inner diameter of the convex portion is smaller than the inner diameter of the top holding member and larger than the outer diameter of the pipe. Item 1. The pipe joint according to Item 1.   3. The pipe joint according to claim 1, wherein the piece holding piece of the piece holding member has elasticity that expands and contracts in an axial direction so that a distance between the ring-shaped body and the holding portion can be minutely changed.   An engaging concave portion and an engaging convex portion that are engaged with each other at a position where the ring-shaped body rides on the cam by rotating the rotating operation ring are provided on a surface in sliding contact between the rotating operation ring and the top holding member. The pipe joint according to claim 1, 2 or 3.

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